pavella



A ug. 25,1925. l 1,551,426`

R.y PAVELLA HOIST Filed Jan. 15, 1925 2 Sheets-Sheet 1 Aug. 25, 1925,.

R. PAVELLA HOIST med Jan. 15. '1923 v1Q Y -appaifentsthatthe hoist of the present inven- Patented Aug. 25, 1925.1

i' ho'ld thes'aidor'ane 1n a invention relates tonhoists.

Some 'offthe objects of the .present inventionareiwto employ a Crane, 'mean's=-or.as ing and lowering the 'crane .,inoludingfa flexible cable "orjthe like,.-and71`nean for holding the crane in Y a raised 1 position .and Align' releasing ysaid zane to loe ilowered; Ito eniploy -nie'ans automatically A.operable to f employ lalle fzgilole oableor thlikefas apaiit ane l detail Views kof ifeatnres- 'of the means forj holding .the ,crane v:in

a 'raised position and aEolnneleasing--the Gitane FigurefeT is a. perspective vieW of one of the detail features.`r j

YRefering now more .pantioulal'rlyfnto the several .views of the drawings, it lwillrloe tion, genenally, ooxfiprises a -or'ae :10, means `Sand which] lso. serlyesi; in-raisilggandinwlweringlthe eranel'O.l i

A(I he orarie V- comprises .preferably two mainsections, a s'eeti'on .141 and-a sectonalh, The section 14 'is'-hollw fandthe jseeton V)1:5 .is tubnlai, u-ppr 'sind pffilh@ ,Semll Th? pas'ed position; .'-to

raised position andifor releasing510,155. crair tof 'be iloweied. Aflexib'le A.caloleelylrl'I tlfelke is .employedto vshchaloadlto fainsedzand lowered with the hoist is directly coxeeted j ton of the section' i141. lilhelateh 18 lis inathe gpppositel'frectihp'., The section xgrae, ,sa pulley ear'riedby L#che Asection I5 :lilies-Pear gement h meenLthgela-ne the parts is such that the piston 31 maybe dropped to the bottom of the cylinder 32 which brings the sheave 29 in proximity to the sheave 27 and at this time the crane 10 is in its lowered position and the hook 38 is in proximity to the basement floor. By admitting a fluid such as water or steam to the cylinder 32 in the operation of the valve V and through pipe 33, the piston 31 will move. upwardly, and as a consequence the hook 38 at the end of the cable will move upwardly until the spring 40 encounters a portion of the crane section 14 whereupon the crane will move upwardly until the bolt of the means' 12 springs into engagement with av portion of the crane section 15 whereupon the crane will be held against further movement in any direction.

,l/Vhen the sheave 29 is completely raised, the piston 31 to which the sheave is connected by the piston rod is at the limit of its up-ward travel. In this position the load hook 38 is also at the limit of its upward travel, the single cable passing from the hook 38 over and under the several sheaves, and being drawn taut when in its position between said hook and the fixed anchorage 37 so .that no further upward movement of the sheaves 29 is possible. The sheaves 27 and 29 are multiple'sheaves and when sheave 29 isat the limit of its upward travel, the cable wound around theseV two groups of sheaves is'that part of the cable which is' payed out as the sheave 29 is lowered, and the part of the cable that has been payed out passes from the sheave 28 over the sheave 25, under the sheave 24, over sheaves 23 and continues down with the lifting hook 38 to the level of sheave 27, when the sheaves 27 and 29 will be together and the piston 31 will be at the limit'of its downward movement of travel. When the crane is being raised or lowered the lifting hook 38 will be tight against the end of the crane arm 14, and the cable will lengthen or shorten `between the sheaves 24 and 25 as sheaves 27 and 29 are brought upward or away from each other at the upward or downward travel of the piston 31.

The means 12 comprises a bolt 42 arranged in a casting 43 attached to the part 21 having aV hole 44 therein which with a hole 45 in the crane section 15 is brought into registry; the bolt being actuated by a spring 46 and being movable into the hole 45 automatically when the hole 45 registers with the hole 44; and a rod 47 supported bymembers 48 and connected at'one end to a pivoted forked lever 49 engageablewiththe bolt 42 behind its head, and the rod having nuts 50 between which one end of a member 51 vhaving compound movement is disposed; the opposite end of saidmember being movable into and out of the path of movement of a lug 52 car,- red by the case of the sheave 29. The member 51 has compound movement inasmuch as it is pivoted as at 53 to a member 54 swivelled as at 55 in connection with a portion of the support 22. The portion 56 o-f the rod 47 below the top member 48 is flexible, and the lower extremity of the portion 56 is disposed in a slot 57 in the lowermost member; 4,8; the portion 56 being of a normal tendency to hold member 51 in such a position that its free end will be out of the pat-h of movement of the lug 52. `When it is desired to have the free end of the member 51 in the path of movement of the lug 52 the member is moved by hand to bring the free end behind a stop 58 carried by member 59 attached to* the support 22. It will now be manifest that when the free end of the member 51 is disposed in the path of movement of the lug 52 that, the latter, as the piston moves through a certain distance, will move the free end of the member 51 upwardly and its opposite end between the nuts 50 downwardly and likewise the rod 47 will be moved downwardly causing the lever 49 to move and as a result the bolt 42 will be withdrawn from the hole 45. then free to move downwardly under its own weight and the weight carried by the cable. Itis, of course, understood that the movement of the bar 51 into the path of movement 52 is accomplished by manually lifting the bar and placing it Opposite of the lug 58 as previously mentioned, thel same will, then be in the path of movement of the member 52. The compound movement which is lateral and vertical'of the bar 51, springs the lower part of the bar 47 out of vertical position and holds it in such position until the upward travel of the sheave 29 causes the parts 51 and 52 to engage each other to lift the bar to a position above the lug 58. Lowering of the sheave 29 will now cause the -tension in the bar 47 to move the bar 51 `back to normal position on the inside of the lug 58. During the process of hoisting, the bar 47 is in its normal vertical position and up and down movement of the sheave 29 will not withdraw the bolt 42, as parts 51 and 52 are out of the same path of vertical movement. The valve V of course is operated to allow the exhaust of the fluid beneath the piston; the said fluid passing through the pipe 33 through the valve to the exhaust pipe 36. The pipe 34 is employed to allow any fluid which might pass the piston 31 to be exhausted from` the cylinder 32 to the exhaust pipe 36.

F rom the foregoing it will be manifest that; the crane 10 may be raised and lowered; the crane is raised by fluid pressure; the crane is automatically locked against movement in a raised position; the crane is prevented from turning while it travels up and down; the cable may be moved independently of the crane; and the crane is CII brought 'down with meansand underv conditionsy controllable by o ne man in 'an veasy manner. Y

What is claimed is: "41. 'in a hoist, acrane capable of being raised and lowered, and means automatically operable to hold the4 crane in an elevated position against movement, said means including a member having compound pivotal movement and being under the influence of a flexible part.

2. In a hoist, a crane capable of being raised and lowered, and means automatically operable to hold the crane in an elevated position against movement, said means including a movable `rod* having a flexible part, and a member mounted for compound pivotal movementunder the influence of said flexible part and in engagement with portions thereof for effecting the movement of the rod when the member is moved.

3. In a hoist, a crane capable of being raised and lowered, and means for holdingy the crane in an elevated position against movement, said meansfcomprising a spring actuated bolt which is engageable with a portion of said crane, a member having compound movement, and a motion transmitting connection between saidspring actuated bolt and said member. i

4. A hoist comprising a crane, means raising and lowering said crane comprising a sleeve in which a part of said crane moves, pulleys rcarried by said crane, pulleys cariied by relatively fixed parts, a fluidv cylinder, a piston-movable in said fluid cylinder, a pulley 'connected to said piston, a single cable which passes over all of said pulleys, which has one end attached and which has a portion engageable with a portion of said crane, a valve in communication with said fluid cylinder for controlling the flow of fluid to and from said fluid cylinder, and means for holdingthe crane in an elevated position. f

.5. A hoist comprising a fixedly mounted slee-ve, a crane having a partV thereof movable in said sleeve, a` pulley on the lower end of the part of said crane whichr moves in said sleeve, a pulley carried yby a relatively fixed part and disposed above the upper limit of movement of the pulley carried by the lower end of the part of the crane which moves in said sleeve, a cable` which passes over said pulleys and having one end thereof attached and the opposite end thereof ex-l tending through said craneand a portion which engages a portion of said crane, and means for exerting a pull on said cable.

6. A hoist comprising a fixedly mounted sleeve, a crane having a part thereof movable in said sleeve, a pulley on the lower end of the part of the crane which moves in said sleeve, means for limiting the movement of the crane in opposite directions,.a pulley 'for carriedf-byl-arelatively 'fixedpart and disposed" above the upper limit-of movement ofthe pulley carried bythe lower end of leys and having one 'end thereof-attached and Athe opposite end extending-through said crane and jap'ortion 'which engages a portion of said crane, and means for exerting a pull on said cable. .f

7. A hoist comprising 4a crane, a flexible cable having a portion which engages a po-rtion of said crane, means for paying out and taking up said flexible cable in the raising and lowering of said crane, means for holding said crane in a raised position, in-r cluding a flexible part, said first means having a movable part, and said second means having a part movable into and out of the path of movement of said movable part in effecting` the lowering of said crane, said' last part having a compound pivotal movement for co-action with said flexiblepart.

8. A hoist comprising a crane capable ofV being raised and lowered, a weighted ilexiyble cable having a portion which'engages a` portion of said crane in the raising thereof, a

means for paying out and 'for taking up said cable in the lowering and raising of said crane, means for holding said crane in a raised position and for releasing said crane n to be lowered, said first means having a movable part, said second means including a part having a compound pivotal movement capable of being moved into and out of the path of movement of said movable part to operate the said means for'holding the crane in a raised position and for the release of saidl crane to a lowered position.

9. A hoist comprising a crane capable of being raised and lowered, a weighted flexible cable having a portion which engages a portion of said crane in the raising thereof, ymeans for taking up and for paying out said cable in the raising and lowering-of said crane, a spring actuated bolt movable linto-and out of engagement with a portion lof said crane and serving to hold said crane in a raised position when in engagement with the portion of said crane, a motion transmission connection including a rod connected to said spring actuated bolt, a member having compound pivotal movement, the said rod having a flexible part which nor- `mally holds said member in a certain posicrane in an elevated rposition while said hoist is operated, means for operating said hoist, means for releasing said crane from said elevated position, and means for lowing said oiane in a raised position, and ering said crane, all of said means eo-opmeans for i'eleasing said Crane from said 10 eiating through the simultaneous movement raised position, said last two means being of a single continuous cable. controlled by said first means.

ll. ln a hoist, the Combination of a Crane, In testimony whereof I hereby aHX my a single cable, means for raising and lowersignature. ing said hoist by said Cable While said crane is in a stationary position7 means for holdy RUDOLPH PAVELLA` 

